26193 A. Lange & Sohne 31 Day 130.025, 130025, platinum case with a unique platinum double fold deployment buckle, manual wind A. Lange & Sohne calibre L034.1, the first movement with 31 days power reserve, the double stacked mainspring is each over 185cm, the constant force escapement allows a continuous draw from the mainspring without loss of accuracy, the accuracy is extremely precise and impressive, "key winding mechanism" is used to wind the watch instead of the traditional winding of the crown, 2 keys are provided with the watch (one in a travel case), patented big date, 31 day power reserve indicated on the dial, rhodium dial, 18k white gold markers, display back is truly a pleasure on this watch, size 45.9mm, thickness 15.9mm, Like New with original box, 2 winding keys and warranty booklet from 2017.